Why would you believe this? First you would have to answer why the scientists are being shunned. Then, is this the same problem in these other countries? Then you have to ask why would it be a bad thing for them to work elsewhere? What about the countless good scientists in the west who are unemployed? Why not be worried about them going to other countries?

I suspect you aren’t involved in science at all. The default is that scientists travel between countries for opportunities. There are far more scientists than jobs for them, especially when you consider the scientists trained in very specific fields. To be concerned with the shunning of a specific nationality of scientists ignore why they may be shunned. And to be concerned with where this specific group will then go, is low-key racist.